A Terahertz Metamaterial Absorber-Based Temperature Sensor Having Nine Resonance Peaks

Year 2021, , 1163 - 1177, 01.12.2021

Fulya Bağcı

https://doi.org/10.35378/gujs.769726

Cited By: 2

Abstract

Design and investigation of a polarization-insensitive nine-band tunable metamaterial absorber at THz frequencies with equal to or more than 90% absorption ratio in all of the bands are reported. The tunable metamaterial absorber consists of four isosceles triangle patches with four U-shaped cut paths on top of an indium antimonide substrate, which has a fully metallic ground plane at the backside. Numerical analyses show that the metamaterial absorber has wide-angle characteristics under transverse-electric and transverse-magnetic modes. The permittivity of indium antimonide is highly dependent on temperature variations due to its temperature-dependent intrinsic carrier density, leading to shift of nine absorption peak frequencies upon change of environment temperature. Broadband switching of nine absorption peak frequencies with maximum 71.5% shift ratio between 190 K and 230 K is obtained. Temperature sensing performance of the metamaterial absorber is further evaluated and the sensitivities are found to be 11.5 GHz/K, 9.2 GHz/K, 8.3 GHz/K, 7.6 GHz/K, 7.0 GHz/K, 6.2 GHz/K, 5.3 GHz/K, 4.5 GHz/K and 4.2 GHz/K, from the first to ninth absorption band, respectively. Therefore, the proposed nine-band metamaterial absorber sensor has great potential in sensitive and accurate temperature measurement, absorption tuning in optoelectronic applications and as frequency selective thermal emitters.

Keywords

Tunable metamaterial, Polarization-insensitive, Absorption ratio, Terahertz frequency, Temperature sensing

Supporting Institution

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK), Ankara University

Project Number

117E5074 ve 17B0443006

Thanks

We gratefully acknowledge the financial support by The Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. 117E504 and Scientific Research Projects of Ankara University (BAP) under Grant No. 17B0443006.

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